Fisher-Rosemount 3095FT, Руководство пользователя

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Rosemount Model 3095FT HART Flow Transmitter
5-8
Process Pulsation
• Adjust the electronic damping (see Page 4-30).
Transmitter Electronics
• Connect a personal computer and use the User Interface Software
to check the sensor limits to ensure calibration adjustments are
within the sensor range and that calibration is correct for the
pressure being applied.
• Make sure the post connectors are clean.
• Confirm that the electronics housing is properly sealed against
moisture.
• If the electronics are still suspect, substitute new electronics.
Impulse Piping
• Check for entrapped liquid in the gas line.
Sensing Element
• The sensing element is not field repairable and must be replaced
if found to be defective. Check for obvious defects, such as a
punctured isolating diaphragm or fill fluid loss, and contact your
nearest Rosemount Service Center.
Symptom: Low PV Reading or No
PV Reading Potential Source and Corrective Action
Orifice Plate
• Check the installation and condition of the orifice plate.
• Note any changes in process fluid properties that may affect
output.
Loop Wiring
• Check for adequate voltage to the transmitter. It should be 11 to
35 V dc.
• Check the milliamp rating of the power supply against the total
current being drawn for all transmitters being powered. The
Model 3095FT requires 8.5 mA.
• Check for shorts and multiple grounds.
• Check for proper polarity at the signal terminal.
• Check loop impedance.
• Check the wire insulation to detect possible shorts to ground.
Impulse Piping
• Check to ensure that the pressure connection is correct.
• Check for leaks or blockage.
• Check for entrapped liquid in the gas lines.
• Check for sediment in the transmitter process flange.
• Check to ensure that blocking valves are fully open and that
bypass valves are tightly closed.
Do not use over 35 volts to check the loop, or damage to the
transmitter electronics may result.